Known problem for me. For both my old Rossini and my current Vivaldi DAC in combination with an LG TV. I then solved it by placing a reclocker in between. When the LG also started burning in, I bought a Sony TV and it was immediately fine without a reclocker. Presumably the dCS devices are (too?) critical? It doesn’t bother me anymore, thankfully.
(Monarch Audio DIP/Upsampler Combo - very old and still in use as TV sound reclocker/upsampler )
What kind of reclocker?
Erno, just as an aside, the synchronous interfaces on dCS platforms, like the SPDIF, are not on the StreamUnlimited interface board (which is purely for the asynchronous interfaces only - Ethernet, USB).
According to StreamUnlimited documentation SPDIF at least can be handled by its interface board, see at bottom:
Thats the subsystem interface into the rest of the dCS platforms (internal). Not user inputs.
Thanks @Anupc . How is SPDIF handled then?
Anyway, I do not think @miguelito 's APEX upgrade has caused his Toslink problem.
I can confirm that the APEX upgrade does not go near the TOSLINK Input. The XLR input sockets need to be unscrewed and the release keys removed to fit the new escutcheon but the TOSLINK connector is hidden behind the input board which is not removed in the process.
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On a separate interface board same as all the other synchronous input interfaces.
Thanks, so if I understand correctly (Rossini DAC internals):
- StreamUnlimited asynchronous input board
- Synchronous input board
Yes for 2., but the 1. in your picture is the modular S800 Compute board (plugged into the 200-pin SO-DIMM interface) not it’s input interface board, which I think (can’t recall exactly) is actually on the right slight left of 2. in your picture.
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Then I come to this:
- StreamUnlimited asynchronous modular S800 Compute board
- plugged into the 200-pin SO-DIMM interface
- Asynchronous interface board (USB, ethernet)
- A: Synchronous interface board (SPDIF, AES)
B: Clock inputs/ output - Analogue outputs
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I think thats pretty much it 
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Actually take a look at this crop of your pic:
I wonder if while installing the APEX board one of these three cables got damaged. Toslink worked previously.
Here is another look at the Toslink internal connection. This part of the Rossini is untouched by the APEX upgrade.
For further assitance I would contact [email protected]
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A toslink module is an optical transciever element which might fail, I would also contact dCS or your dealer about it @miguelito